I use Mozilla Firefox 52.8.0 on Ubuntu 16.04.4

This error message is a permanent nuisance when using tex.stackexchange

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Is it a bug on your side or should I fix anything on my side?

Could the hint be here:

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  • 4
    I don't have any problems here on Windows with Firefox 60.0.2. What about clearing your browser cash and all that stuff (and upgrading)? – Werner Jun 21 '18 at 17:13
  • 1
    I don't have a problem with Linux (Fedora) and Firefox 60.0.1. – Nicola Talbot Jun 21 '18 at 19:00
  • 2
    this problem hits me sometimes, especially on my office workstation (windows professional, behind a heavy firewall). it's sometimes able to be reversed by explicitly re-entering the url with https. on my (ancient, out-of-date) macbook, if it happens with firefox, it can sometimes be reversed by switching to a newer, different browser. but if those tactics don't work, then notifying the target site that their certificate is out of date is likely the only solution i've come up with. – barbara beeton Jun 22 '18 at 12:19

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